First, venomous not poisonous.P.S. Nonsensical Trivia!
What is THE most poisonous spider in the world?
A. Black Widow
B. Grandaddy Longlegs
D. Brown Recluse
Second, granddaddy longlegs are neither spiders nor do they have venom glands or fangs.
Third, the Brazilian Wandering Spider is generally agreed to be the most venomous spider in the world.